CCNA2 V4.0 Exploration - Chapter 6

Chapter 6 - Exam Answers

1. What two advantages does CIDR provide to a network? (Choose two.)

--> reduced routing table size

--> reduced routing update traffic

2. Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?

--> 192.168.4.15/29

3. In the network shown in the graphic, three bits were borrowed from the host portion of a Class C address. How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not used?

--> 84

4. Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)

--> 32-bit address

--> Subnet mask

5. Refer to the exhibit. The network administrator wants to create a subnet for the point-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?

--> 255.255.255.252

6. What does VLSM allow a network administrator to do?

--> utilize multiple subnet masks in the same IP address space

7. Which three interior routing protocols support VLSM? (Choose three.)

--> OSPF

--> RIP v2

--> EIGRP

8. Which of the following problems does VLSM help to alleviate?

--> the shortage of IP addresses

9. Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A ping from the S0/0/0 interface on R1 to host B fails. The technician begins testing the network and has the following results:

1. pings from R1 to the S0/0/0 interface on R2....successful

2. pings from R1 to the Fa0/0 interface on R2....successful

3. pings from host B to hosts on the 10.1.1.0/24 network....successful

4. pings from host B to the Fa0/0 interface on R2....successful

5. pings from R2 to host B....successful.

What is the likely cause of the failure of the ping from R1 to host B?

--> The default gateway on host B is not correctly set.

10. A network administrator is tasked with dividing up a class C network among the QA, Sales, and Administration departments. The QA department is made up of 10 people, the Sales is made up of 28 people, and the Administration has 6. Which two subnets masks adequately address the QA and Sales departments? (Choose two.)

--> 255.255.255.224 for Sales

--> 255.255.255.240 for QA

11. Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?

--> 192.168.0.0/21

12. A Class C address has been assigned for use in the network shown in the graphic. Using VLSM, which bit mask should be used to provide for the number of host addresses required on Router A, while wasting the fewest addresses?

--> /27

13. Refer to the exhibit. In the network that is shown, the router interfaces are assigned the first address in each subnet. Which IP address would be usable for a host on one of the LANs in this network?

--> 192.168.2.130/25

14. Refer to the exhibit. What subnet mask will be applied if Router A sends a RIPv1 update for the network 172.16.1.0 to Router B?

--> 24

15. Refer to the exhibit. The number of required host addresses for each subnet in a network is listed in the exhibit. This number includes the host address requirements for all router ports and hosts on that subnet. After all device and router port address assignments are determined, what will be the total number of unused host addresses available?

--> 29

16. An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of 14 useable addresses for this link while wasting the fewest addresses?

--> 192.1.1.224/28

17. What is a supernet?

--> a summarization of classful addresses

18. Refer to the exhibit. A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router running RIPv2. The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts. The network administrator assigned 10.0.1.128/25 to the Admin subnet. The Sales subnet is given 10.0.1.192/26. What will be the result of this addressing scheme?

--> The subnets overlap and will be rejected by the router.

19. A router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks are summarized by this route?

--> 192.168.32.0 – 192.168.47.0/24

20. Refer to the exhibit. The network administrator wants to minimize the number of entries in Router1’s routing table. What should the administrator implement on the network?

--> CIDR

---------------------------------------------------------------------